[usb:usb-testing 39/44] drivers/usb/dwc3/dwc3-qcom.c:301:23: warning: no previous prototype for function 'dwc3_qcom_read_usb2_speed'

[usb:usb-testing 39/44] drivers/usb/dwc3/dwc3-qcom.c:301:23: warning: no previous prototype for function 'dwc3_qcom_read_usb2_speed'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
head:   477122a1eec325621cefd62da8bd8ac20a66fb8e
commit: 4387ea43e3a9dac058adfe5fc68e0e82750201e5 [39/44] usb: dwc3: qcom: Configure wakeup interrupts during suspend
config: mips-randconfig-r024-20220611 (https://download.01.org/0day-ci/archive/20220611/202206111907.EvH06x2T-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ff4abe755279a3a47cc416ef80dbc900d9a98a19)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mipsel-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?id=4387ea43e3a9dac058adfe5fc68e0e82750201e5
        git remote add usb https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
        git fetch --no-tags usb usb-testing
        git checkout 4387ea43e3a9dac058adfe5fc68e0e82750201e5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/usb/dwc3/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/usb/dwc3/dwc3-qcom.c:301:23: warning: no previous prototype for function 'dwc3_qcom_read_usb2_speed' [-Wmissing-prototypes]
   enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
                         ^
   drivers/usb/dwc3/dwc3-qcom.c:301:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
   ^
   static 
   1 warning generated.


vim +/dwc3_qcom_read_usb2_speed +301 drivers/usb/dwc3/dwc3-qcom.c

   300	
 > 301	enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom)
   302	{
   303		struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
   304		struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci);
   305		struct usb_device *udev;
   306	
   307		/*
   308		 * It is possible to query the speed of all children of
   309		 * USB2.0 root hub via usb_hub_for_each_child(). DWC3 code
   310		 * currently supports only 1 port per controller. So
   311		 * this is sufficient.
   312		 */
   313		udev = usb_hub_find_child(hcd->self.root_hub, 1);
   314	
   315		if (!udev)
   316			return USB_SPEED_UNKNOWN;
   317	
   318		return udev->speed;
   319	}
   320	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp